Filament Transformers

MSI Filament TransformerFilament Transformers

Filament Transformers are single phase transformers used to drive the low impedance filament of an electron vacuum tube.


  • Power rating up to 10 KVA
  • Primary Voltage up to 600V
  • High current secondary: bus or lead connection depending on specification
  • Single phase
  • Frequency: 50 or 60 Hz
  • Aluminum or copper windings



  • High Impedance
  • Center Tapped secondary winding
  • UL Recognized insulation system (Primary voltage must be less than 600V) – 130, 180, and 220°C systems are available
  • CE marking with declaration of conformity ROHS and Low Voltage Directive where applicable
  • Private labeling with customer supplied nameplate artwork Units that are private labeled cannot carry our UL label
  • Enclosure NEMA 1 or NEMA 3R
  • Thermal switches
  • Test Reports with optional Certificate of Compliance